i wouldnt use it if it has a killing agent in it.
and mr.wtf does the bag have instructions it might also be that it needs to be mixed in with the soilo
I would rather not put any nutes on and grow more naturally than put nutes on that have low quality control and are made for grass. Lawn fertilizer really? Doesn't that shit kill dogs if they eat it? If it were me I would either go to a hydro store, get some online or find a friend that has some. If you were close to me I would give you a nutes cycle for your plants lol.
IMO I wouldn't put anything on them until there are a least 3 weeks old. Then put just a little bit and go from there. The plant will tell you if she likes it or not. Just monitor it closely for the next few days and see what happens.
If I lived in nowhereville, and only had that option, then I would just use a seedling mix or coco cut with at least 25% perlite, and then make tea's with that fertilizer starting off with a very light tea, like 0.5 ec / 250 ppm, and then keep upping it by 0.5 ec / 250 ppm until I hit the sweet spot! Yeah, I wouldn't ever mix that kind of fertilizer straight into my soil, tea it only!